Senior Application Developer

Primary Job Title: Senior Application Developer / Senior .NET Developer

Alternate/Related Job Titles:

Senior .NET Software Engineer

Full Stack Windows Developer

Application Migration Engineer (.NET)

Location: New York, NY

Onsite Flexibility: Onsite (potential hybrid; to be confirmed)

Contract Details:

Position Type: Contract

Contract Duration: 6 months (potential for extension)

Pay Rate: $75-$82/hr

Job Summary:

The Senior .NET Developer will lead the modernization of a legacy Front Office Windows application, transitioning from .NET Framework to .NET 8. The role focuses on enhancing performance, implementing advanced multithreading, and optimizing architectural design. This position demands deep expertise in WinForms, WPF, Windows Services, and SQL Server, ideally in a financial services context.

Key Responsibilities:

Lead the migration of a legacy application to .NET 8, with performance and architecture optimization.

Develop multithreaded components using TPL, async/await, and concurrency control patterns.

Maintain and enhance Windows Services for background processes.

Implement XML data processing and Excel Interop for data sharing.

Integrate RESTful APIs for secure financial data exchanges.

Use Git for source control and TeamCity for CI/CD pipeline management.

Optimize SQL Server performance through advanced tuning techniques.

Collaborate with cross-functional teams to ensure scalable, maintainable solutions.

Perform code profiling, debugging, and software performance optimization.

Contribute to unit testing and broader automation initiatives. Required Experience:

7-10 years of professional development experience.

Demonstrated success migrating large-scale applications to .NET 7+.

Proven expertise in:

C#, WinForms, WPF

Windows Services

Multithreading and parallel processing

XML serialization and processing

SQL Server performance tuning

Git and TeamCity CI/CD practices Nice-to-Have Experience:

.NET 8 implementation experience

Financial systems or trading application background

Knowledge of PRISM and Component Application Block

Azure or AWS cloud integration

Python scripting for automation

Familiarity with OTC derivatives Required Skills:

.NET Application Migration (.NET Framework to .NET 8)

WinForms/WPF UI Development

Multithreading and Concurrency (TPL, async/await) Preferred Skills:

Financial Data API Integration

Windows Services Architecture

SQL Server Query Optimization

TeamCity CI/CD Pipelines

XML & Excel Interop Additional Skills:

Agile SDLC & iterative development

Simulation and modeling of software architecture

Operational and tactical planning support

Benefits:

Medical, Vision, and Dental Insurance Plans

401k Retirement Fund

About the Client:

Leading North American financial institution offering a wide range of reliable financial products and services. Committed to customer satisfaction and community impact, they provide personalized banking solutions to meet your unique needs. Join a diverse and inclusive team dedicated to creating a more secure and sustainable future.

About GTT:

GTT is a minority-owned staffing firm and a subsidiary of Chenega Corporation, a Native American-owned company in Alaska. As a Native American-owned, economically disadvantaged corporation, we highly value diverse and inclusive workplaces. Our clients are Fortune 500 banking, insurance, financial services, and technology companies, along with some of the nation's largest life sciences, biotech, utility, and retail companies across the US and Canada. We look forward to helping you land your next great career opportunity!

25-24422 : #LI-GTT #LI-Onsite